Smoke-preventing furnace



(No Model.)

- O. L. STACY.

SMOKE PREVENTING FURNACE.

Patented Jan. 23, 1894.

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wAsmNaYcm a UNITED STATES PATENT Erica.

CHARLES L. STACY, OF OOVINGTON, KENTUCKY.

SMOKE-PREVENTING FURNACE.

SPECIFICATION forming part of Letters Patent No. 513,154, dated January 23, 1894.

Serial No. 434,058- (No model-l To all whom it may concern.-

Be it known that I, CHARLES L. STACY, a citizen of the United States, and a resident of Oovington, Kenton county,State of Kentucky, have invented a certain new and useful Improvement in Smoke-Preventing Boiler-Furnaces; and I do declare the following to be a full, clear, and exact description of theinven-. tion,such as will enable others skilled in the art to which it appertains to make and use the same, attention being called to the accompanying drawings, with the reference-numerals marked thereon, which form a part of this specification.

This invention relates to improvements in smoke-preventing boiler-furnaces where the combustion of the heavy smoke and volatile, carbonaceous gases which generate rapidly after the supply of fuel, is aided by the admission of additional air entering abovethe grate-bars and in excess of the normal airsupply and while said smoke and gases are retarded and held within the fire-box by jets of live steam injected thereinto.

The object of my invention is to. provide by a simple construction new and improved means to admit and regulate this additional air-supply and these means consist substantially in the construction of a fire-door for such a furnace and its use and combination therewith.

scale, of a fire-door detached, and provided with my invention.

10, indicates a part of a suitable steamboiler, 11, is the fire-box, 12, is the fire door and 13, are the grate-bars. 1

In economic firing the fresh fuel should be supplied always at the front part of the grate, theburning and incandescent coal being gradually pushed rearwardly. The object is to cause the freshly evolved gases to pass over the hot coals to become consumed. In most cases this result is however not practically attained by reason of the development of the gases being too rapid, while the air-supply through the grate bars, closely covered by the freshly supplied fuel,isinsufficient. The consequence is, that a considerable quantity of the valuable gases pass off unburned in the form of smoke, before they have time to be consumed. This premature escape is prevented by a sheet of steam emitted through a series of jets 14, which are inclined inwardly at such an angle as to strike the grate-bars aboutvlnidway of their length, respectively at a point back of the freshly supplied fuel. This retards the too rapid escapement rearwardly, of the developed gases, while at the same time fresh air is supplied to them directly above and independent of the grate-bars. For the purpose of admitting this additional airsupply, I provide an opening 15 in the lower part of the fire-door 12. A deflector 16, permanently secured to the inside of the latter and above its opening, throws the entering .air directly against the green fuel. Thereby the required air is supplied to the retarded gases and smoke until their combustion is substantially accomplished. Opening 15, may be closed whenever desired by a door 17. hinged to the outside of main-door 12, and of which it forms a part when so closed. See Figs. 2 (right door) and 3. The area of the opening may be regulated by a segmental rack 18, piv-" otally secured to the smaller door and engaging with a stop 19. When door. 12, is to be opened for the purpose of supplying fuel, all its appendages, that is door 17, and deflector 16, move with it and are therefore out of the way.- The steam-jets receive their. supply from a pipe 20, passing upwardly and charged from the boiler. A valve 21, regulates and I shuts off the supply. It is preferable to have extra pipes or jackets 22, surrounding jets 14, where they pass through the brick-work of the front of the boiler-furnace. They also ex.- tend outwardly beyond pipe 20, where they are provided with cocks 23, which are normally closed. In case the mouth of a jet be-- comes closed up, these cocks may be opened,

whereupon a wire can be introducedfor the purpose of removing the obstruction. In

larger furnaces extra air-inlets 15, and deflector 16, may be provided between and independent of the fire-doors.

Having described my invention, I claim as new- 1. In improvements on smoke-preventing boiler-furnaces, the combination of the gratebars, the fire-doors 12 provided with an opening 15 in their lower part, a door 17 for this opening hingedabove it to the outside of door 12 and swinging outwardly therefrom, a segmental rack 18 pivotally secured to door 17, a stop 19 for it secured to the lower partofdoor 12, a permanent deflector 16, affixed to the inside of the fire-door above its opening and projecting inand downwardly therefrom, a series of inclined steam-jets 14 inclosed by jackets 22, a steam supply-pipe 20 for them and cooks 23 in an extension of each jet to be used for the purpose described.

2. An improved fire-door for smoke-preven ting boiler-furnaces to admit additional air above the grate-bars to the fuel within the fire-box, for which purpose such door is pro- Vided with an opening, in its lower part, a door 17 hinged above it to the outside of the firedoor and swinging outwardly therefrom, a segmental rack 18 pivotally secured to door 17 extending inwardly therefrom and adapted to hold said door open, a stop 19, secured to the lower part of the fire-door with which this rack is capable of engaging and a permanent deflector 16, affixed to the inside of the firedoor above its opening and projecting inand downwardly therefrom.

In testimony whereof I affix my signature in presence of two witnesses.

OH ARLES L. STACY.

Witnesses:

O. SPENGEL, WM. KRAMER. 

